myria_web: for logical plan, show the optimized logical plan
raco: upgrade with efficiency improvements and some new features
fix raco bug
fix raco bug v2
raco: update submodule
myria_web_main: fix bug in 32 bits

Relations with many tuples may be ints or longs if Python is 32 bits.
fix tests with updated raco
Merge pull request #205 from uwescience/production

Production -> master